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//Written by Fabian Figueredo
//http://oberdata.com.ar info@fabianfigueredo.com.ar

//Based from: http://www.martinwilley.com/net/code/imgthumbhelper.html

using System;
using System.IO;
using System.Web;
using System.Drawing;
using System.Drawing.Imaging;

namespace AFDS.Controls.Handlers
{
    public class ImageHandler : IHttpHandler
    {
        #region IHttpHandler Members

        /// <summary>
        /// Gets a value indicating whether another request can use the <see cref="T:System.Web.IHttpHandler"></see> instance.
        /// </summary>
        /// <value></value>
        /// <returns>true if the <see cref="T:System.Web.IHttpHandler"></see> instance is reusable; otherwise, false.</returns>
        public bool IsReusable
        {
            get { return false; }
        }

        /// <summary>
        /// Enables processing of HTTP Web requests by a custom HttpHandler that 
        /// implements the <see cref="T:System.Web.IHttpHandler"></see> interface.
        /// </summary>
        /// <param name="context">An <see cref="T:System.Web.HttpContext"></see> object 
        /// that provides references to the intrinsic server objects 
        /// (for example, Request, Response, Session, and Server) used to service HTTP requests.
        /// </param>
        public void ProcessRequest(HttpContext context)
        {

            if (!string.IsNullOrEmpty(context.Request.QueryString["picture"]))
            {
                string fileName = context.Request.QueryString["picture"];
                int iwidth = int.Parse(context.Request.QueryString["width"]);

                try
                {
                    string folder = "~/App_Data/thumbnail/";
                    FileInfo fi = new FileInfo(context.Server.MapPath(folder) + fileName);

                    if (fi.Exists)
                    {

                        WriteThumbnailSimple(context, fi.FullName.ToString(), iwidth);
                    }
                    else
                    {

                        context.Response.Status = "404 Bad Request";
                    }
                }
                catch (Exception ex)
                {
                    context.Response.Status = "404 Bad Request";
                }
            }
        }

        #endregion


        public static void WriteThumbnailSimple(HttpContext context, string filename, int width)
        {
            using (Image imgThumb = CreateThumbnailSimple(filename, width))
            {
                HttpContext.Current.Response.ContentType = "images/jpeg";
                imgThumb.Save(context.Response.OutputStream, ImageFormat.Jpeg);
            }
        }


        public static Image CreateThumbnailSimple(string filename, int width)
        {
            Image imgThumb;
            //get bitmap from file (see also GetBitmapFromEmbeddedResource)
            using (Bitmap bitmap = GetBitmapFromFile(filename))
            {
                //create a callback delegate
                Image.GetThumbnailImageAbort myCallback = delegate { return false; };

                //preserve aspect ratio
                decimal aspectRatio = (decimal)width / bitmap.Width;
                if (aspectRatio < 0) aspectRatio = 1;
                int thumbnailHeight = Convert.ToInt32(bitmap.Height * aspectRatio);
                if (thumbnailHeight > (width * 2))
                {
                    thumbnailHeight = width * 2;
                    aspectRatio = (decimal)thumbnailHeight / bitmap.Height;
                    width = Convert.ToInt32(bitmap.Width * aspectRatio);
                }

                //images with thumbnails (from most digital cameras) have embedded thumbnails so scale badly
                //rotating 360 apparently kills the embedded thumbnail
                //source: http://aspnet.4guysfromrolla.com/articles/012203-1.2.aspx
                bitmap.RotateFlip(RotateFlipType.Rotate180FlipNone);
                bitmap.RotateFlip(RotateFlipType.Rotate180FlipNone);
                //grab the thumbail from the image
                imgThumb = bitmap.GetThumbnailImage(width, thumbnailHeight, myCallback, IntPtr.Zero);
            }
            return imgThumb;
        }

        public static Bitmap GetBitmapFromFile(string filename)
        {
            return new Bitmap(filename);
        }


    }
}
